#include "mymath.h"

int myerrno = 0;

int add(int x, int y)
{
  return x + y;
}

int sub(int x, int y)
{
  return x - y;
}

int mul(int x, int y)
{
  return x * y;
}

int div(int x, int y)
{
  if (y == 0) {
    myerrno = 1;
    return -1;
  }
  return x / y;
}

